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T. M ERRIAM & A. G. ALLEN,

STEAM GENERATOR. I

No. 64,021. PatentedApr, 23, 186 7.

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Letters Patent No. 64,021, dated April 23, 1867; antedatcd A p'n'l 19, 1867.

IMPROVEMENT IN STEAM GENERATORS.

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To-ALL WHOM 1g: MAY CONCERN:-

Be it known that we, TRUMAN MERRIAM and ALANSON G. ALLEN, of Waterloo, in the county of Jefferson, and State of Wisconsin, have invented a new and useful Improvement in Steam Generators; and we do hereby declare that the following is a full, clear, and exact description of the same, reference being bad to the annexed drawings, making part of this specification, in which- Figure 1 is a perspective view.

Figure 2 is a. transverse vertical section.

Figure 3 is an end elevation partly in section.

Figure 4 is'a longitudinal section.

The same letters are employed in the different figures in indicating identical parts.

A is the fire-box for wood or coal, which wemake of cast iron, (with the tubes hereinafter describcd,) cas in'the body of the plates, sustaining detachable cast-iron plates, B, which are made with perforations 'or in form of lattice-work, so as to retain fire-clay, with which they are coated on the inner surface, whercexposed to the heat. On these sides, forming the top of the furnace, we place the tank 0, which receives the cold water, and in which it is. heated before being pumped into the boilers. Across the open space in the fire-box, above the fire and below the tank, is placed a series of cast-iron cylinders, of suitable strength for resisting the pressure of the steam. These cylinders may, however, be made of boiler plate if'prcferred. These cylinders are placed in successive tiers, with spaces between them for the free passage of the draught. They are connected by pipes, E and F,which are cast or otherwise constructed in,the end plates of such cylinders, or they may be formed by grooves in the end plates and other plates tightly fastened to such end plates; but as sucl1,eaps will then form, in fact, part of the endplatesfa nd'a's these 'forursotwrrstruciion are substantially identical, we shall claim both under the general expression, pipes formed in the end plates of the cylinders. The boilers E are connected by pipes E with the two cylinders F, placed immediately above them, and each of these is connected by a pipe, F, with the cylinder above it, and so on as far as the series may he carried. The steam thus heated to any required degree is taken from the upper tier of cylinders to the engine. A force-pump maybe placed onthe lead pipe if desired, to qualify the temperature of the steam by ejecting small quantities of hot water into the dry steam, or by ejecting oil to lubricate the cylinders of the engine, or thcreductioamiaybe made in the second set of cylinders adjacent to the set described. The pipes H conduct the hot water from the tank-C to the force-pump I, liy which it'is forced through the pipes K into the boiler E, which boiler or cylinder con- 'tains two copper evaporating troughs, X, set one above the other, so that the water thrown by the pumps shall fall upon the upper one, run its length, and, falling upon the second one, traverse also his length, being co i1- verted into steam by contact with the heated troughs. Should any water not be vaporized, it will fall upon the highly heated surface of the cylinder and be at once converted into steam. The pipes passing from the pumps to the boiler wecast in the plates forming the walls'of the fire-box, in coils, so as to receive additional heat in passing from the pump to the boilers. Inthe drawings we show two sets of tiers of cylinders, to each of which belongsaforcepump; the pipes K respectively passing throughthe fire walls of the furnace on the side nearest the boiler to which they lead. L L are blow-oil" cocks attached to the boilers E E. D is the smoke-stack. The heat rising from the fire, passing freely around the respective cylinders, the steam therein is superheated and dried, and the series of tiers should be continued as long as they can be used for utilizing any portion of the heat evolved by the combustion of the fuel. I

What we claim, as our invention, and desire to secure by Letters Patent, is-

1. The combination of the cylinders F. F G, arranged in sn'ccessive tiers above the furnace, and connected by pipes formed in their end plates with a. corresponding set of similar cylinders, into which the steam' is passed from the first set, and in which it is tempered by the introduction of water or oil, substantially in the manner and for the purpose set forth.

2. The perforated or latticed metallic walls of the furnace, when constructed and arranged substantially as set forth. v i

3. The arrangement of the tank O, induction pipe H, pump I, eduction pipes K, and the furnace walls, substantially as set forth. i

. TRUMAN MERRIAM, Witnesses: ALANSON G. ALLEN.

S. M., Cons, W. G. Manson. 

